TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance

Photocatalysis is proven to be the most efficient and environmentally friendly method for the degradation of organic pollutants in water purification. To meet the requirement of large-scale water treatment, there are two important points: One is the lifetime and chemical stability of the photocataly...

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Autores principales:	Lan Gao, Elyes Nefzaoui, Frédéric Marty, Mazen Erfan, Stéphane Bastide, Yamin Leprince-Wang, Tarik Bourouina
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanostructure water purification atomic layer deposition ZnO nanowires TiO<sub>2</sub> coating Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/efd98e12f21e4914a783ed94381ac65c
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spelling	oai:doaj.org-article:efd98e12f21e4914a783ed94381ac65c2021-11-25T17:05:29ZTiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance10.3390/catal111112892073-4344https://doaj.org/article/efd98e12f21e4914a783ed94381ac65c2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1289https://doaj.org/toc/2073-4344Photocatalysis is proven to be the most efficient and environmentally friendly method for the degradation of organic pollutants in water purification. To meet the requirement of large-scale water treatment, there are two important points: One is the lifetime and chemical stability of the photocatalyst material, especially in the complex and harsh aqueous conditions. The other is the ease of synthesis of such photocatalysts with specific nano-morphology. In this work, two common photocatalyst materials, zinc oxide (ZnO) and titanium dioxide (TiO<sub>2</sub>), are selected to form more sustainable photocatalysts with high chemical stability. This involves the combination of both TiO<sub>2</sub> and ZnO in a two-step simple synthesis method. It appears advantageous to exploit the conformal deposition of atomic layer deposition (ALD) to achieve nanometer-thick TiO<sub>2</sub> coating on ZnO nanowires (NWs) with a high aspect ratio, which are firmly anchored to a substrate and exhibit a large specific surface area. The high chemical stability of the ALD TiO<sub>2</sub> coating has been investigated in detail and proven to be effective under both strong acid and strong alkaline aqueous solutions. In addition, photocatalysis experiments with organic dyes show that via this simple two-step synthesis method, the produced ZnO/TiO<sub>2</sub> tandem photocatalysts does indeed exhibit improved chemical stability in a harsh environment, while allowing efficient photodegradation.Lan GaoElyes NefzaouiFrédéric MartyMazen ErfanStéphane BastideYamin Leprince-WangTarik BourouinaMDPI AGarticlenanostructurewater purificationatomic layer depositionZnO nanowiresTiO<sub>2</sub> coatingChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1289, p 1289 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanostructure water purification atomic layer deposition ZnO nanowires TiO<sub>2</sub> coating Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	nanostructure water purification atomic layer deposition ZnO nanowires TiO<sub>2</sub> coating Chemical technology TP1-1185 Chemistry QD1-999 Lan Gao Elyes Nefzaoui Frédéric Marty Mazen Erfan Stéphane Bastide Yamin Leprince-Wang Tarik Bourouina TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
description	Photocatalysis is proven to be the most efficient and environmentally friendly method for the degradation of organic pollutants in water purification. To meet the requirement of large-scale water treatment, there are two important points: One is the lifetime and chemical stability of the photocatalyst material, especially in the complex and harsh aqueous conditions. The other is the ease of synthesis of such photocatalysts with specific nano-morphology. In this work, two common photocatalyst materials, zinc oxide (ZnO) and titanium dioxide (TiO<sub>2</sub>), are selected to form more sustainable photocatalysts with high chemical stability. This involves the combination of both TiO<sub>2</sub> and ZnO in a two-step simple synthesis method. It appears advantageous to exploit the conformal deposition of atomic layer deposition (ALD) to achieve nanometer-thick TiO<sub>2</sub> coating on ZnO nanowires (NWs) with a high aspect ratio, which are firmly anchored to a substrate and exhibit a large specific surface area. The high chemical stability of the ALD TiO<sub>2</sub> coating has been investigated in detail and proven to be effective under both strong acid and strong alkaline aqueous solutions. In addition, photocatalysis experiments with organic dyes show that via this simple two-step synthesis method, the produced ZnO/TiO<sub>2</sub> tandem photocatalysts does indeed exhibit improved chemical stability in a harsh environment, while allowing efficient photodegradation.
format	article
author	Lan Gao Elyes Nefzaoui Frédéric Marty Mazen Erfan Stéphane Bastide Yamin Leprince-Wang Tarik Bourouina
author_facet	Lan Gao Elyes Nefzaoui Frédéric Marty Mazen Erfan Stéphane Bastide Yamin Leprince-Wang Tarik Bourouina
author_sort	Lan Gao
title	TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
title_short	TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
title_full	TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
title_fullStr	TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
title_full_unstemmed	TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance
title_sort	tio<sub>2</sub>-coated zno nanowire arrays: a photocatalyst with enhanced chemical corrosion resistance
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/efd98e12f21e4914a783ed94381ac65c
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TiO<sub>2</sub>-Coated ZnO Nanowire Arrays: A Photocatalyst with Enhanced Chemical Corrosion Resistance

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